Most of the lavas in the Strawberry Mountains were erupted from a central vent about 4000 feet in diameter which is exposed in the cliffs above Little Strawberry Lake. The pinnacles known as “Rabbit Ears,” above the prominent talus in figure 15, are of vent breccias that consist mostly of welded blocks of scoriaceous basalt, but also contain volcanic bombs which were blown out as blobs of fluid lava. Huge blocks of the breccia have fallen onto a gentle bare slope west of Little Strawberry Lake. The massive, vertically-jointed cliffs are formed of basalt which cooled slowly and formed a plug in the throat of the volcano after the eruptions ceased. The thin irregular scoriaceous andesite flows, which are exposed in the cliffs east of Little Strawberry Lake adjoining the plug, contrast strikingly with the massive even flows of the Picture Gorge Basalt. Tilting of the Strawberry Mountain block is shown by the southward dip of all the flows in the area. The flows in the cliffs west of Strawberry Lake, for example, originally must have sloped northward away from the vent where they erupted. Their present southward dip of about 15° therefore indicates that they have been rotated more than 15° by faulting, partly along the northern edge of the mountain range. (Fig. 14 ). Selected References To Detailed Reports U. S. Geological Survey Maps: No. 1-447 Geologic Map of the Canyon City quadrangle, northeastern Oregon, by C. Ervin Brown and T. P. Thayer, 1966. The map covers the entire region at a scale of one inch equals 4 miles. GQ-438 Geologic Map of the Aldrich Mountain quadrangle, Oreg., (with text) by T. P. Thayer and C. Ervin Brown, 1966. GQ-548 Geologic Map of the Mount Vernon quadrangle, Oreg., (with text) by C. Ervin Brown and T. P. Thayer, 1966. MF-51 Preliminary Geologic Map of the John Day quadrangle, Oreg., by T. P. Thayer, 1956. U. S. Geological Survey Professional Papers: No. 550-C Local thickening of basalts and silicic volcanism in the Canyon City quadrangle, Oreg., by T. P. Thayer and C. E. Brown, pages C73-C78, 1966. _(From material provided by Thomas P. Thayer)_ [Illustration: ] As the Nation’s principal conservation agency, the Department of the Interior has basic responsibilities for water, fish, wildlife, mineral, land, park, and recreational resources. Indian and Territorial affairs are other major concerns of America’s “Department of Natural Resources.” The Department works to assure the wisest choice in managing all our resources so each will make its full contribution to a better United States—now and in the future. Transcriber’s Notes --Silently corrected several typos. --Provided all images resized and oriented for use on a portable eBook reader. --Provided clickable links to higher-resolution versions of detailed images.